0
4.3kviews
Define noise figure and noise factor
written 5.1 years ago by | modified 5.1 years ago by |
Subject: Priniciples of Communication Engineering
Difficulty : Medium
Marks : 05
ADD COMMENT
EDIT
1 Answer
written 5.1 years ago by | modified 5.1 years ago by |
Subject: Priniciples of Communication Engineering
Difficulty : Medium
Marks : 05
written 5.1 years ago by | modified 5.1 years ago by |
Noise factor (f)
It is defined as ratio of signal to noise ratio at the input to signal to noise ratio at the output of the receiver. Ideally value of F is 1 for a receiver. SNR at the input is always higher than SNR at the output hence practically noise factor will be greater than 1.
Noise factor (f) = $\frac{SNR \ at \ the \ input}{SNR \ at \ the \ output}$
Noise figure (NF)
If the noise factor is expressed in decibels then it is called noise figure (NF)
NF = 10 log (Noise Factor)
NF = 10 log $\frac{SNR \ at \ the \ input}{SNR \ at \ the output}$